Pigweed-Amaranthus Pigweed can mean any of a number of weedy plants which may be used as pig fodder:
Amaranthus species
Amaranthus palmeri, the 'pigweed' resistant to glyphosate in the US southeast.
Chenopodium album (White Goosefoot)
Portulaca species Pigweed.info~Site InfoWhoisTrace RouteRBL Check